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Simplifying 9 = -2(a + -3) Reorder the terms: 9 = -2(-3 + a) 9 = (-3 * -2 + a * -2) 9 = (6 + -2a) Solving 9 = 6 + -2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2a' to each side of the equation. 9 + 2a = 6 + -2a + 2a Combine like terms: -2a + 2a = 0 9 + 2a = 6 + 0 9 + 2a = 6 Add '-9' to each side of the equation. 9 + -9 + 2a = 6 + -9 Combine like terms: 9 + -9 = 0 0 + 2a = 6 + -9 2a = 6 + -9 Combine like terms: 6 + -9 = -3 2a = -3 Divide each side by '2'. a = -1.5 Simplifying a = -1.5
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